Variables not set in adapter testing framework

The problem I’m having

When running the basic tests for an adapter as shown in this guide, I’m not seeing variables being set in the created dbt_project.yml file.
The contents of the created project file for the basic test is

name: generic_tests
profile: test

In my models/schema.yml the variables target and seed_name are being used but, aren’t set in the project.

version: 2
  - name: raw
    schema: "{{ var('target','schema') }}"
      - name: seed
        identifier: "{{ var('seed_name', 'base') }}"

In this test, I don’t see these variables being overridden anywhere. How are these supposed to be set?

The context of why I’m trying to do this

Upgrading an adapter to support dbt-core v1.7